When 1.7 rolls out, we will be adding a new survival world. Called "Play," this new survival world will replace the current play world, which will be renamed "Old_Play". We know how hard people have worked on their homes, and wouldn't want them to lose their homes. Only players who have already played on Old_Play can access it. This is done to encourage players to play on the new map, allowing us to eventually discontinue the old map.